JP5371321B2 - Cutting method for veneer veneer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting method of standard size veneers, the method being conveniently adaptable to properties (partially different shrinkage ratio) of veneers and reducing waste in wood resources, fuel expenses necessary for drying and the like. <P>SOLUTION: In the cutting method of standard veneers, a centering device installed in the front of a veneer lathe: measures the outline of a heart wood 4b in advance in both butt ends with respect to the rotary center axis of material wood 4; estimates the entire shape of the heart wood 4b; divides by estimation a veneer 11 to be cut by the veneer lathe before standard size cutting into two kinds comprising a veneer 11b cut from the heart wood only and a veneer 11a cut from other portions (portions with sapwood portion 4a included at least in part); and for the standard length L1 of the veneer 11b cut from the heart wood only, elongates the standard length L2 of the veneer 11a cut from other portions suitably by a length &alpha;; and cuts each to standard size. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a method for cutting a regular veneer veneer.

  Conventionally, a veneer veneer obtained by turning a log using a veneer lace (hereinafter simply referred to as a veneer), a veneer having a length longer than a desired standard length is desired. A process of transferring to the next drying process is performed after a standard cut for each standard length and forming into a rectangular standard single sheet. In the case of drying treatment, there is a considerable difference in shrinkage ratio between a standard veneer with a high shrinkage ratio and a standard veneer with a low shrinkage ratio (for example, a standard veneer with a low shrinkage ratio). In contrast, a single plate having a large shrinkage ratio shrinks more than 1% of the standard length).

  Therefore, if it is always cut at a uniform length, even if a single plate with the largest shrinkage is dried, the length will not cause a shortage after drying. Therefore, it is necessary not only to waste the wood resources, but also to the extra size part of the standard veneer with a relatively small shrinkage ratio. In addition, there is an inconvenience that the cost for drying the veneer is wasted.

Thus, in the past, the shrinkage ratio of a veneer was related to the moisture content of the veneer, and it was generally assumed that as the moisture content increased, the shrinkage ratio also tended to increase. As disclosed in Patent Document 1, a moisture content detector for measuring the moisture content of a single plate is provided at the front of a regular cutting device for cutting a single plate at a regular size, and the detection signal of the moisture content detector is used as a detection signal of the moisture content detector. Based on the standard length of the low moisture content veneer, an attempt has been made to suppress the occurrence of the inconvenience by appropriately lengthening the fixed length of the high water content veneer. .
Japanese Examined Patent Publication No. 54-6108

  However, according to the study by the inventors of the present invention, the contraction rate of the veneer is more closely related to the difference in the partial properties of the raw wood, and the heartwood part where the cells are already dead Compared to the contraction rate of the veneer cut from the slab, the contraction rate of the veneer cut from the sapwood part where the cells are actually alive is actually larger, and it happens to be a common log. Since the moisture content of the sapwood part is higher than the moisture content of the core part, the moisture content of the veneer is measured based on the above assumption, and the contraction rate of the veneer is measured. Can be produced by the method of cutting the length of Patent Document 1 in which the length of the length is adjusted and the length of the length is adjusted. There was a defect.

  That is, for example, due to circumstances of storage conditions, a veneer cut from the sapwood part of the raw wood that has a dry outer surface will dry even if the moisture content measured by the moisture content detector is low. Since the shrinkage rate is close to the value of the original high water content, if it is cut at a standard length corresponding to the measured low water content, a problem of insufficient dimensions after drying tends to occur. Or, for example, a veneer cut from a black core part called a black core has a significantly higher water content than a single board cut from a normal core part, but the shrinkage when dried Is a value close to that of the original low moisture content, and therefore, if it is cut at a standard length corresponding to the measured high moisture content, a problem of excessive dimension after drying tends to occur. Furthermore, for a veneer cut from a mixed part in which the core material part and the sapwood part are mixed in the circumferential direction, for example, the measurement by the moisture content detector is different between the front side and the back side, etc. Since it is likely to be unstable (indeterminate), it is often difficult to set an appropriate standard length, or excessive and insufficient dimensions after drying.

  The present invention is intended to suppress waste of valuable resources while suppressing the occurrence of insufficient dimensions after drying by providing a method for cutting a single-size plate that conforms to the above-mentioned substance. Specifically, in the centering device provided in front of the veneer lace, by measuring the contour of the core material part of both ends of the wood with respect to the rotation center axis of the raw wood in advance, the entire shape of the heartwood part is estimated, Estimate and classify the single plate cut from veneer lace before cutting, into single plate cut only from core material and single plate cut from other parts. The length of the single plate cut from the other part is appropriately lengthened, and the length of the single plate cut from the other is cut appropriately. In the cutting method (Claim 1) and the centering device provided at the front of the veneer race, Measure the contour of the core material part of both ends of the wood log relative to the rotation center axis, estimate the overall shape of the core material part, and cut the veneer laced single plate from the core material part only before cutting. There are three types: single plate formed, single plate cut only from sapwood part, and single plate cut from mixed part where core material part and sapwood part are mixed in the circumferential direction Estimate and make the length of the single plate cut only from the sapwood portion longer than the length of the single plate cut only from the heartwood portion, as appropriate, and The standard length of a single plate cut from the mixed part is between the standard length of the single plate cut only from the core part and the fixed length of the single board cut only from the sapwood part. A method of cutting a single-sized plate (Claim 2), characterized in that each is cut as a length, and a centering provided at the front of the veneer lace In the device, measure the contour of the core part of both ends of the wood with respect to the rotation center axis of the raw wood and the outline of at least one outer peripheral surface other than the vicinity of both ends of the raw wood and the vicinity of both ends, Estimate the overall shape, and cut the veneer laced single plate into two types: single plate cut from the core material and single plate cut from the other parts. Estimate and divide the length of the single plate cut from the other parts by the length of the single plate cut from the core part. In a method for cutting a single-sized plate (Claim 3) characterized by cutting a fixed length and a centering device provided at the front of the veneer race, the core material on both ends of the log with respect to the rotation center axis of the original wood The outline of the part and the outline of at least one outer peripheral surface other than the vicinity of both ends of the raw wood and the vicinity of both ends Measure, guess the overall shape of the core material part, and cut the veneer laced single board before the regular cutting from only the core material part and the sapwood part. Estimated and classified into three types: single plate and single plate cut from the mixed part where the core part and sap part are mixed in the circumferential direction. With respect to the scale length, the standard length of the single plate cut from only the sap material portion is appropriately lengthened, and the single plate cut from the mixed portion, A standard length characterized by cutting a standard length between the standard length of a veneer cut only from the core part and a fixed length of the veneer cut only from the sapwood part. Based on the cutting method of the veneer (Claim 4) and the color of both ends of the raw wood, the contours of the core parts of the ends of both ends relative to the rotation center axis are measured. That claim 1 or claim 2 or claim 3 or claim 4 Blank veneer cutting method described (claim 5) proposes a.

According to the cutting method for a single plate according to claim 1 of the present invention, the single plate cut from the other portion with respect to the fixed length of the single plate cut from only the core portion. The standard length is increased by an appropriate length (in other words, a standard single board obtained from a mixed area where a single board cut from the sapwood part and a single board cut from the core part are mixed. The length of the same is the same as the length of a single plate cut only from the sapwood portion) , and each of them is cut at a fixed length. Therefore, compared with the invention according to claim 2 of the present application, Although the board acquisition rate is slightly reduced, a single board cut from the sapwood part of the raw wood whose outer peripheral surface is dry, or a mixed part where the core part and sapwood part are mixed in the circumferential direction There is no risk of lack of dimensions at least after drying for fixed-size veneers cut from all veneers, including veneers cut from In addition, there is no risk of a problem of excessive dimension after drying with respect to a single plate cut from a single plate cut from a core part called a black core. Even if compared with the cutting method of a board, there is little waste and it is useful.

  Moreover, according to the cutting method of the single-sized board which concerns on Claim 2 of this invention, the fixed length of the single board cut from the above-mentioned mixed part is made into the fixed length of the single board cut only from a core material part. Since it cuts a fixed length as an intermediate length between the fixed length and the fixed length of the single plate cut only from the slab portion, the method for cutting a fixed single plate according to claim 1 is used. Compared to this, there is less waste and it is beneficial.

  Thus, when the length of the raw wood is relatively short, the contours of the core part of the both ends of the wood with respect to the rotation center axis of the raw wood, as in the cutting method of the single veneer according to claim 1 and claim 2 From the above, the entire shape of the core material part is estimated, and the single plate cut from the veneer lace is cut from the single plate cut only from the core material part and the other part. Signals and information necessary for presumably classifying into two types of plates, for example, the boundary position between a single plate cut from only the core material portion and a single plate cut from a portion other than the core material portion, or, for example, the core material Even if the total amount of veneer cut from only the part is calculated, there is practically no problem, but when the length of the raw wood is relatively long, the estimation error due to the bending of the raw wood tends to increase. Therefore, as in the method for cutting a fixed veneer according to claim 3 and claim 4, In addition to the contour of the heartwood part on both ends of the wood with respect to the central axis, measure the contour of at least one outer peripheral surface other than the vicinity of both ends of the raw wood and the vicinity of both ends to estimate the overall shape of the heartwood part, and the boundary position It is preferable to calculate the total amount. Of course, if necessary, even if the length of the raw wood is relatively short, the method for cutting a single plate according to claims 3 and 4 may be applied.

  In addition, as a means for measuring the contour of the core part of the both ends of the wood with respect to the rotation center axis of the raw wood, measurement is performed based on the colors of the both wood fronts of the raw wood, as in the method of cutting a single plate according to claim 5. The means is convenient, and in particular, domestically produced cedars whose usage has been remarkably increasing recently are suitable for measurement by the means because the difference in color between the heartwood part and the sapwood part is remarkable.

  In addition, if the properties of the raw wood are analyzed in more detail, strictly speaking, the transition material in the process of changing from the sapwood portion to the corewood portion has a narrow range between the corewood portion and the sapwood portion. However, in the present invention, for the sake of convenience, the transition material is included in the sapwood portion. To do.

  In the following, the present invention will be described in further detail together with an example of the embodiment illustrated in the drawings. In the present invention, the rotation center axis of the raw wood determined by the centering device is in close contact with the location of the contour of the core part. Since it is a related matter, when referring to the centering device and the rotation center axis of the raw wood, a mechanism for measuring the contour of the core part can be added to the structure of the centering device used for carrying out the present invention. In addition, there is no particular restriction, and in short, any structure that can determine the center axis of rotation as desired based on the desired data regarding the target log is sufficient, and various known centering devices can be used as will be described later. It is possible to divert without any particular problem, and various known methods for determining the rotation center axis can be used.

  For example, a few examples of the structure of a known centering device are disclosed in, for example, “Method and device for centering and diameter discrimination of raw wood for veneer race” (Japanese Patent Publication No. 42-17612). As shown in the figure, on both sides of a pair of left and right pedestals that support the raw wood so as to be movable in the vertical direction and the front-rear direction on the inner side of both ends, a plurality of centers having the same height as the axis of the spindle of the veneer race A pair of left and right pattern projectors that project the circular pattern of both sides of the raw wood onto the both ends of the raw wood, and the operator moves the raw wood in the vertical direction and the front-back direction via the cradle, whereby the annular pattern and the raw wood A rotation center axis of the log that coincides with the spindle axis of the spindle, and a structure in which the log that defines the rotation center axis is gripped by both ends and transferred to a veneer race, or For example, in the above structure In addition to the concentric annular pattern projector, a pair of left and right central projectors that project the center point of the same height as the spindle axis onto the both ends of the raw wood, and for measurement and visual measurement by the operator Based on this, the log with the appropriate mark at the desired center position of both ends is supported by the cradle and moved in the vertical and forward / backward directions so that the mark matches the center point. A structure in which a rotation center axis of a raw wood coinciding with the axis of the spindle is determined and transferred to a veneer race, or as disclosed in, for example, “Raw wood centering device” (Japanese Patent Publication No. 51-27031) Instead of the concentric ring pattern projector in the above structure, it is equipped with a TV camera that shoots the both ends of the raw wood, a concentric multiple circular mask on the CRT, and both ends of the raw wood projected on the CRT Same as mask A structure in which the log is moved up and down and back and forth through the cradle so as to align with the circle, and the rotation center axis of the log that matches the axis of the spindle is determined and transferred to the veneer race, or For example, as disclosed in “Automatic centering device for log logs” (Japanese Utility Model Publication No. 53-143294), a pair of upper and lower parts that move up and down synchronously with respect to the center of the same height as the axis of the spindle of the veneer race. A V-grooved pedestal is provided in the vicinity of both log mouths of the raw wood, and by holding the V-grooved pedestal near the both wood mouths from above and below, the rotation of the raw wood matching the spindle axis of the spindle is achieved. A structure in which the center axis is determined and transferred to the veneer lace, or, for example, “centering method and charger in veneer lace” (Japanese Patent Publication No. 60-17682), “centering processing method of raw wood and centering processing device of raw wood” ( As disclosed in Japanese Patent Application Laid-Open No. 2004-338391) and the like, a log is rotated around a temporary rotation axis, and a non-contact type sensor is used to form several outer peripheral shapes in the axial direction of the log. The rotation center axis that adapts to the measured outer peripheral shape is determined, and the log is displaced so that the rotation center axis coincides with the axis of the spindle, and is transferred to the veneer race. Instead of the non-contact type sensor in the above-mentioned structure, for example, a contact type sensor is provided, or a non-contact type sensor and a contact type sensor are provided side by side in the axial direction of the raw wood. Measure the outer peripheral shape of several places, determine the rotation center axis that adapts to the measured outer peripheral shape, and displace the log so that the rotation center axis coincides with the axis of the spindle. To the veneer race In recent years, the progress of image processing technology has been remarkable, so the images of the two wood fronts taken by the camera are processed to determine the desired rotation center axis, and the rotation center A structure in which a log is displaced so that the shaft coincides with the axis of the spindle and is transferred to a veneer race has been gradually put into practical use.

  On the other hand, as to how to determine the rotation center axis, for example, as illustrated in FIG. 6 (A) of the Japanese Patent Application Laid-Open No. 2004-338391, the raw wood is relatively accurately obtained so that more strip-like single plates can be obtained. How to determine the outer shape to match the axis of the largest inscribed cylinder that does not include any local recesses in the raw wood, or, for example, as shown in FIG. In order to obtain more, measure the outline shape of the raw wood relatively coarsely, or silence the measurement information of the local recesses, to the axis of the largest inscribed cylinder that exaggerated the local recesses of the raw wood As disclosed in, for example, “Method of cutting log in veneer race” (Japanese Examined Patent Publication No. 62-45803), in addition to the method of determining to match, or the method of determining the intermediate position between the two determination methods. Durable in the thickness direction There are more veneers with uniform moisture content, as disclosed in the method of determining the center of the annual ring so that more plates can be obtained, or as disclosed in, for example, “Raw Wood Turning Method” (Japanese Patent Publication No. 2-8881) A typical example is to determine the location of the heartwood based on the difference in color or moisture content distribution between the front ends of the two logs so that it can be obtained, and to determine the core corresponding to the shape of the heartwood. These are all applicable to the practice of the present invention.

  In the embodiment described in detail below, for the sake of convenience of clarifying the location range of the heartwood portion and the sapwood portion, the description of annual rings on the front ends of the raw wood illustrated in the drawings is omitted. did.

  FIG. 1 is a front explanatory view of a centering device used in the practice of the present invention, FIG. 2 is a partially enlarged side explanatory view taken along line YY in FIG. 1, and FIG. FIG. 3 is a partial plan view of a veneer cut from the raw wood exemplified in 2; In the figure, 1a, 1b and 2a, 2b are a pair of upper and lower V-groove pedestals, each of which is located in the vicinity of both ends of the log 4 is a connecting mechanism comprising a chain, a chain wheel, a rotating shaft, etc. 1 is provided so that it can be moved up and down synchronously about the central axis Q in the direction of the arrow shown in FIG. Each time the log 4 is supplied onto 1a, 2a, the operation of the lifting mechanism 3 composed of a fluid cylinder, a servo motor, etc. is obtained, and each approaches the central axis Q synchronously, and the log 4 is moved from above and below. By pinching, the rotation center axis of the log 4 is determined at the position of the center axis Q (hereinafter, the rotation center axis of the log 4 is also indicated by the symbol Q). Further, for example, a veneer lace (not shown) is obtained after gripping the wood 4 that has been centered at an appropriate position (for example, both ends) via a log transfer mechanism (not shown) such as a swing type or a reciprocating type. ), The operation of the elevating mechanism 3 is obtained, and the V-grooved pedestals 1a, 1b and 2a, 2b are separated from each other, and the holding of the raw wood 4 is released.

  Reference numeral 5 denotes a color sensor camera, which takes a picture of both ends of the log 4 with the rotation center axis Q determined by the V-groove cradle 1a, 1b and 2a, 2b.

  Reference numeral 6 denotes an information processing apparatus which receives photographing information from the color sensor camera 5 and measures the contours of the heartwood portion 4b of both ends of the wood with respect to the rotation center axis Q based on the colors of both ends of the raw wood 4. Then, the entire shape of the core material portion 4b is estimated, and the single plate 11 before cutting that is cut from the veneer lace is cut from the single plate 11b cut only from the core material portion 4b and other portions. Signals and information necessary to estimate and classify into two types of single plate 11a formed, for example, single plate 11b cut from only core material portion 4b and single plate cut from a portion other than core material portion 4b The boundary position with 11a, or the total amount of the veneer 11b cut only from the core part 4b, for example, is calculated, and the signal and information are transmitted to a regular cutting device behind the veneer race (not shown).

  For example, the centering device configured as described above is used to center the raw wood 4 and the information processing device 6 measures the contours of the core portions 4b on both ends with respect to the centering rotation center axis Q. Thus, for example, the outline of the core portion 4b on the left end of the log 4 is a thin line indicated by reference numeral S1 in FIG. When the contour of the core part 4b is a contour as indicated by a dotted line indicated by symbol S2 in FIG. 2, as indicated by symbol A1, the rotation center axis Q is the center, and the two contours S1, S2 are the same. A single plate 11b cut only from the core part 4b is cut from the portion of the largest inscribed cylinder that falls within the overlapping range (the area where the slanted line shown by the thin line and the slanted line shown by the dotted line overlap). From a portion outside the largest inscribed cylinder represented by A1, a single plate cut from a portion other than the core portion, in other words, a single plate 11a including at least a portion of the sapwood portion 4a is cut. It is estimated that

  Therefore, in the invention according to claim 1 of the present invention, as illustrated in FIG. 3, the fixed length of the single plate 11b cut only from the core part 4b is L1, and the single plate 11b is cut from a part other than the core part. When the standard length of the single plate 11a is L2, the standard length of each single plate is determined so that L2 = L1 + α, and the standard length is sequentially cut at the standard cutting position indicated by the symbol K. Is. However, it is preferable that the specific value of α is determined based on an experimental result of confirming the shrinkage rate by drying each veneer. For example, in the cedar produced in the Sanin region, about 1% of the standard length L1. That was a rough guide.

  According to such a cutting method, there is no risk that the fixed-size single plate cut from all the single plates will be short of dimensions at least after drying, and the ratio of occurrence of over-dimensions is reduced. Compared to any method of cutting a single plate, there is little waste and it is beneficial.

  Next, when the log 4 is centered using the same centering device, and the contour of the core part 4b on both ends of the wood with respect to the centering rotation center axis Q is measured by the information processing device 6, for example, The contour of the heartwood part 4b on the left end of the log 4 is a contour like a thin line indicated by S3 in FIG. However, if the contour is as indicated by the dotted line S4 in FIG. 4, as indicated by the symbol A2, the rotation center axis Q is the center, and the maximum is within the overlapping range of the two contours S3 and S4. A single plate 11b cut from only the core part 4b is cut from the inscribed cylindrical portion, and the two contours S3 and S4 are centered on the rotation center axis Q as indicated by reference numeral A3. The outer part of the smallest circumscribed cylinder that can be included without excess or deficiency Further, the veneer 11c cut only from the sap portion 4a is cut, and from the portion from the outside of the maximum inscribed cylinder A2 to the inside of the minimum circumscribed cylinder A3, in other words, in the circumferential direction. From the mixed portion where the core material portion 4b and the sapwood portion 4a are mixed, it is estimated that the veneer 11d including the core material portion 4b and the sapwood portion 4a is cut.

  Therefore, in the invention according to claim 2 of the present invention, as illustrated in FIG. 5, the fixed length of the single plate 11b cut only from the core part 4b is L1, and the single plate 11b is cut only from the sap part 4a. When the fixed length of the single plate 11c is L2, the fixed length of both the single plates is determined so that L2 = L1 + α, and the fixed length of the single plate 11d cut from the mixed portion is When L3, the standard length L3 is an intermediate length between the standard length L1 and the standard length L2, that is, L1 <L3 <L2 (for example, L3 = L1 + α / 2). The fixed length of each single plate is determined, and the fixed length is sequentially cut at the fixed cutting position indicated by the symbol K. However, L3 = L1 + α / 2 is one example, and in short, a value satisfying the relationship of L1 <L3 <L2 is sufficient, and if necessary, the core part 4b and the sap part 4a It is possible to measure the mixing ratio of and to increase or decrease step by step within the range of L1 <L3 <L2 corresponding to the mixing ratio.

  According to such a cutting method, a single plate cut from the mixed portion can be removed from a fixed-size single plate cut from all the single plates. Since there is a reduced possibility that the single-sized plate obtained by the fixed-size cutting will be excessive in size, it is more useful than the method for cutting a single-sized single plate according to the first aspect.

  Next, FIG. 6 is a front explanatory view of a centering device having a configuration different from the example of FIG. In the figure, reference numeral 7 denotes a pair of left and right temporary core spindles, and both of the raw wood 4 supplied through an appropriate raw wood supply mechanism (not shown) are centered on an appropriately determined temporary rotation center axis Qx. Grasp on the end of the wood and rotate the log 4 at least once.

  Reference numeral 8 is a reflection type distance measuring device disposed at a position not hitting the outer peripheral surface in the vicinity of the both ends of the log 4 and in the center, and in the vicinity of the both ends of the log 4 and in the center. The distance to the outer peripheral surface is measured every time the log 4 is rotated by an appropriate angle, and the measurement information is transmitted to the information processing apparatus 10 described later.

  Reference numeral 9 denotes a pair of left and right color line sensor cameras arranged at positions where both the front ends of the log 4 can be scanned. Each time the log 4 is rotated by an appropriate angle, the colors on the both ends of the log 4 are rotated. And the scanning information is transmitted to the information processing apparatus 10 to be described later.

  Reference numeral 10 denotes an information processing apparatus, based on the measurement information from the distance measuring device 8, the contour of the outer peripheral surface with respect to the temporary rotation center axis Qx in the vicinity of the both ends of the log 4 and at the center, Based on the color scanning information from the color line sensor camera 9, the contours of the core part 4 b with respect to the temporary rotation center axis Qx on the both ends of the log 4 are calculated, and the contours of the outer peripheral surface are calculated. Or the position of the rotation center axis of this formula (formal) suitable for turning of the raw wood 4 based on the calculation result of the contour of the outer peripheral surface and the calculation result of the contour of the core part 4b on the both ends. To do. Then, a signal or information necessary for aligning the rotation center axis of this type with the axis of the spindle of the veneer is displaced by an appropriate amount in a suitable direction between the pair of left and right temporary core spindles 7 of the centering device. This is transmitted to the mechanism or a moving mechanism that moves the gripping arm (not shown) of the log supply mechanism by an appropriate amount in an appropriate direction. (Preferably, as will be described later, the contour of the heartwood portion of the central portion of the log assumed from the measurement information of the distance measuring device 8 is also estimated), and the single plate before the standard cutting is previously described. Signals and information necessary for presuming classification into three types or types are transmitted to a regular cutting device behind a veneer race (not shown).

  Even if the centering device having such a configuration is used, the invention according to claim 1 and the invention according to claim 2 of the present invention can be implemented, and the measurement by the distance measuring device 8 can be performed. A configuration for estimating the contour of the heartwood part in the center of the log assumed from the information is added, that is, the relative positional relationship between the contour of the outer periphery of the log and the core of the log is In accordance with the relative positional relationship between the contour of the outer peripheral surface near the two log mouths and the contour of the outer peripheral surface of the central portion of the log, Estimate the relative position of the heartwood part in the center of the log with respect to the heartwood part on the front of both ends, and estimate the overall shape of the heartwood part by adding a configuration that estimates the contour of the heartwood part in the center of the log Accordingly, the invention according to claim 3 of the present invention and the invention according to claim 4 are provided. It can be carried out, even if the timber is curved, it is effective because it improves the classification accuracy in estimating classified into two types or three types mentioned earlier the veneer before the fixed-length cutting.

  In addition, if it explains supplementarily about the specific method of determining the cutting position which cut | disconnects the single plate before fixed cutting for every desired fixed length, generally the position which starts fixed cutting is the preceding sapwood It is customary to set the appropriate position of the veneer cut from the part. In the invention according to claim 1 or claim 3 of the present invention, the veneer and the core part cut only from the core part. Until the boundary position with the veneer cut from the other portion passes through the cutting position of the regular cutting device, the invention according to claim 2 or claim 4 of the present invention Until the boundary position between the veneer machined from only the part and the veneer machined from the above-mentioned mixed part passes through the cutting position of the regular cutting device, it is usually cut from the preceding slab part. Start the regular cutting from the appropriate position of the single plate to be formed, repeat the regular cutting sequentially, and any one of the boundaries However, in the invention according to claim 2 or claim 4 of the present invention, the boundary position between the veneer cut from the above-mentioned mixed portion and the veneer cut only from the core material portion is set. In addition, after passing through the cutting position of the standard cutting device, the standard length is corrected appropriately, and the standard cutting may be repeated again. The signal and information related to each boundary position are necessary conditions for correcting the standard length, but may be implemented in the form described below if necessary.

  That is, for example, as disclosed in “a method for cutting a veneer veneer in a veneer cutting / cutting process” (Japanese Patent Application No. 2007-328533), each raw log has a specified decore diameter. The total length of the strip-shaped veneer that is cut when cutting up to is predictively calculated, and it is cut incidentally at the tail of the strip-shaped veneer. The distance calculated backward from the boundary position between the belt and the strip-shaped veneer is within the range of the total length calculated in a predictive manner, and calculates a specific location that is an integer multiple of the fixed length of the fixed veneer, The specific position is set as the starting position (starting position) of the standard cutting, and the standard cutting is started, or, for example, “a method of standard cutting of a veneer single plate in a single plate cutting process” (Japanese Patent Application) As disclosed in "2008-1055", each raw wood is cut to a specified core diameter for each raw wood. In addition to predictively calculating the total length of the strip-shaped veneer that will be cut in the event of failure, it will be cut incidentally at the tail of the strip-shaped veneer and the defective veneer with a triangular cross-section when expanded The distance calculated backward from the boundary position with the veneer is within the range of the total length calculated in a predictive manner, and a preliminarily defined cutting length and a length that is an integral multiple of the fixed length of the fixed veneer. Calculate the specific location that is the added length, and use the specific location as the starting position of the standard cutting, and start the standard cutting, and the standard length of the standard single plate When calculating the integral multiple length, for example, according to the amount of the strip-shaped single plate cut from a portion other than the core material portion (Claim 1 or Claim 3) or, for example, cut from a mixed portion. Depending on the amount of the strip-shaped veneer and the strip-shaped veneer cut only from the sap part (Claim 2 or Claim 4) It is also possible to carry out in such a manner that the length is corrected, the specific portion is calculated in a complementary manner, and the specific portion is used as a starting point position of the regular cutting, and the regular cutting is started. According to this processing mode, each time a single log is processed, a random veneer having an unspecified length is not generated behind the fixed veneer. Is unnecessary, and thus the process can be simplified.

  As is apparent from the above, the present invention is a cutting method that is conveniently adapted to the properties of the raw wood (single veneer), and is less wasteful and useful compared to the prior art, and the depletion of wood resources and the increase in fuel costs are significant. In light of the current situation, the implementation effect of the present invention in this field is enormous.

It is front explanatory drawing of the centering apparatus used for implementation of this invention. FIG. 2 is a partially enlarged side view taken along line YY in FIG. 1. FIG. 3 is a partial plan view of a veneer cut from the log illustrated in FIGS. 1 and 2. It is a partial expanded side surface explanatory view at the time of pinching another raw wood with the centering apparatus of FIG. FIG. 5 is a partial plan explanatory view of a veneer cut from the raw wood illustrated in FIG. 4. It is front explanatory drawing of another centering apparatus used for implementation of this invention.

Explanation of symbols

1a, 1b, 2a, 2b: A pair of upper and lower V-groove pedestals 3: Elevating mechanism 4 for V-groove pedestals 4: Raw wood 4a: Sapwood portion 4b: Heartwood portion 5: Color sensor camera 6, 10: Information processing device 7: A pair of left and right temporary lead spindles 8: Reflective distance measuring device 9: Color line sensor camera 11: Single plate 11a: Single plate 11b cut from a portion other than the core material portion: Cut only from the core material portion Single plate 11c: Single plate 11d cut from only the sapwood portion: Single plate A1, A2 cut from the mixed portion: Maximum inscribed cylinder A3 that fits in the core portion A3: Minimum circumscribing that includes the core portion without excess or deficiency Cylinder K: Standard cutting positions L1, L2, L3: Single plate standard length Q: Center axis of centering device (rotation center axis of raw wood)
Qx: Temporary rotation center axis S1, S3: Contour of the heartwood part at the left end of the raw wood S2, S4: Outline of the heartwood part at the right end of the raw wood α: Appropriate length to be corrected

Claims (5)

  The veneer veneer is cut by supplying the veneer lace with the raw wood with the center axis of rotation in the centering device provided at the front of the veneer lace, and then cutting the veneer veneer. When cutting at regular lengths, the centering device preliminarily measures the contours of the core parts of both ends of the log with respect to the rotation center axis of the raw wood, and estimates the overall shape of the core parts. Estimated classification of veneer veneer cut from a veneer lace before standard cutting into two types: veneer veneer cut only from the core part and veneer veneer cut from other parts However, the length of the veneer veneer cut from the other part of the veneer veneer cut only from the core part is appropriately lengthened, respectively. A method for cutting a veneer veneer having a fixed length.   The veneer veneer is cut by supplying the veneer lace with the raw wood with the center axis of rotation in the centering device provided at the front of the veneer lace, and then cutting the veneer veneer. When cutting at regular lengths, the centering device preliminarily measures the contours of the core parts of both ends of the log with respect to the rotation center axis of the raw wood, and estimates the overall shape of the core parts. The veneer veneer that is cut from the veneer lace before cutting is divided into the veneer veneer that is cut only from the core part and the veneer veneer that is cut only from the side part. This is divided into three types of veneer veneer cut from the mixed part where the core part and sapwood part are mixed, and for the standard length of the veneer veneer cut only from the core part, When the standard length of veneer veneer cut only from the sapwood part is lengthened appropriately The standard length of the veneer veneer cut from the mixed portion is the same as the length of the veneer veneer cut only from the core material portion and the length of the veneer veneer cut only from the sapwood portion. A method for cutting a fixed-length veneer veneer, characterized in that a fixed-length cut is performed as an intermediate length between the measured length and the length.   The veneer veneer is cut by supplying the veneer lace with the raw wood with the center axis of rotation in the centering device provided at the front of the veneer lace, and then cutting the veneer veneer. In the centering device, in the centering device, the outline of the core part of the both ends of the wood with respect to the rotation center axis of the raw wood, the vicinity of both ends of the raw wood and the vicinity of both ends Measure the contour of the outer peripheral surface of at least one location, estimate the overall shape of the core material part, and remove the veneer veneer before cutting from the veneer lace only from the core material part. It is divided into two types: veneer veneer that is cut from other parts and veneer veneer that is cut from other parts. The length of the veneer veneer that is formed is increased by an appropriate length. Cutting method standard dimension veneer, characterized in that the length cut.   The veneer veneer is cut by supplying the veneer lace with the raw wood with the center axis of rotation in the centering device provided at the front of the veneer lace, and then cutting the veneer veneer. In the centering device, in the centering device, the outline of the core part of the both ends of the wood with respect to the rotation center axis of the raw wood, the vicinity of both ends of the raw wood and the vicinity of both ends Measure the contour of the outer peripheral surface of at least one location, estimate the overall shape of the core material part, and remove the veneer veneer before cutting from the veneer lace only from the core material part. Estimated classification into three types: veneer veneer that is cut only from the board, sapwood part, and veneer veneer that is cut from the mixed part where the core part and sap part are mixed in the circumferential direction However, for the standard length of veneer veneer cut only from the core part, The length of the veneer veneer cut from the material part is lengthened appropriately, and the length of the veneer veneer cut from the mixed part is cut from the core part only. Of the veneer veneer, characterized by cutting the veneer veneer as a middle length between the veneer veneer veneer and the veneer veneer cut only from the side part. Cutting method.   5. A fixed-length veneer veneer according to claim 1, 2, 3 or 4, wherein the contours of the core parts of both ends of the wood with respect to the rotation center axis are measured based on the colors of both ends of the raw wood. Cutting method.

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